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FILE - In this footage taken by presidential aide Dave Powers and photographed from a television screen, President John F. Kennedy, accompanied by his wife, Jacqueline, waves from his limousine in Dallas on Nov. 22, 1963. According to an AP-GfK survey done in April 2013, about 6 in 10 Americans say they believe multiple people were involved in a conspiracy to assassinate President John F, Kennedy, while only one-fourth think Oswald acted alone. Belief in a conspiracy, though strong, has declined since a 2003 Gallup poll found 75 percent said they thought Oswald was part of a wider plot. The Powers film, uncovered by the Assassination Records Review Board and released Thursday, Nov. 21, 1996, shows Kennedy's trip to Texas Nov. 21-22, 1963, prior to the assassination. Powers ran out of film before the motorcade entered Dealey Plaza where the fatal shots where fired. (AP Photo/Assassination Records Review Board, Dave Powers)

FILE - In this footage taken by presidential aide Dave Powers and photographed from a television screen, President John F. Kennedy, accompanied by his wife, Jacqueline, waves from his limousine in Dallas on Nov. 22, 1963. According to an AP-GfK survey done in April 2013, about 6 in 10 Americans say they believe multiple people were involved in a conspiracy to assassinate President John F, Kennedy, while only one-fourth think Oswald acted alone. Belief in a conspiracy, though strong, has declined since a 2003 Gallup poll found 75 percent said they thought Oswald was part of a wider plot. The Powers film, uncovered by the Assassination Records Review Board and released Thursday, Nov. 21, 1996, shows Kennedy's trip to Texas Nov. 21-22, 1963, prior to the assassination. Powers ran out of film before the motorcade entered Dealey Plaza where the fatal shots where fired. (AP Photo/Assassination Records Review Board, Dave Powers)